Centrifugal salt-drier



(No Model.) 2 Sheets-'Sheet 1. J.M.DUN.GAN. GENTRIFUGAL SALT DRIER. No. 498,383. Patented May 30,-1893- Mm @2gb/675502',

J.M. DUNCAN. CENTRIPUGAL SALT DRIER.

.2 Sheets-Sheet 2.

(No Model.)

No. 498,383. Patented May 30, 1893.

NrrnD STATES I PATENT OFFICE.

JOSEPH M. DUNCAN, OF SILVER SPRINGS, NEW YORK.

CENTRIFUGALsAL'T-DRIER.

SPECIFICATION formingy part of Letters Patent No.'498,383, dated May 30, 41893.

Application tiled Mai-ch 3l,

d To all whom t may concern.-

Be it known that I, JOSEPH M. DUNCAN, a

citizen of'the United States, residing at Silver Springs, in the county of Wyoming and State of New York, have invented new and useful Improvements in Centrifugal Salt-Driers, of which the following is a specification.- y

This invention relates to that class of centrifugal drying machines which are provided with a movable valve yin the bottom forl discharging the salt, or other materiahafter itis dried.

The objects-of my inventionare to provide means whereby' the valve is rendered watertight when closed, and to provide'a simple and reliable coupling or holding device whereby the valve is held against its seat.

In the accompanying drawings consisting of two sheets: Figure l is a vertical section of a centrifugal salt drier, provided with my improvements. Fig. 2 is a horizontal section' in line 2-2,Fig. 1. Fig. 3 is atop plan view, on an enlarged scale, of the lower coupling sleeve whereby the valve is held in its raised position. Fig.4 is a side elevation thereof. Fig. 5 is a bottom plan view, on an enlarged scale, of the upper coupling sleeve whereby.v

the valve is held in its raised position. Fig. 6 is` a sectional elevation thereof. Fig. 7 is an enlarged sectional View of a portion of the valve and its seat. Fig. S is a horizontal section, on an enlarged scale, in line 8-8, Fig. 1.

Like letters of reference refer to like partsr in the several figures.

A represents the'verticaly driving spindle which is journaled at its upper andlower vends in bearings@ a and which is provided near its upper end with a driving pulley a2.

B represents the perforated basket which receives the wet salt to be dried.' This basket is supported at its upper end by a spider C A secured to the spindle, and isprovided at its lower end with an linwardly tapering flange d. The inner edge of the flange d. isprovided with a depending collar E, having in its inner face an annular' groove e which receives a packingk ring or gasket e of rubber' or similar iiexible material. The inner face of this packing ring projects inwardly beyond the lowerportion e2 of the collar, while the upper portion e3 of the collar projects inv closing the valve.

Serial No. 468,520. (No model.)

Wardly beyond the packing ring, as represented in Fig. 7. v F represents the vertically movable conical valve, arranged in the opening of the bottom,

and provided with a sleeve f which is mounted on the spindle below the spider,so as to slide vertically onl thespindle in opening and Then the valve is raised, its marginal portion .bears againsttherubber tight joint with the bottom flange.

In centrifugal' salt driers, as

was seated against a 'plain metal-lic face heretofore constructed, the marginal portion of the valve Y formed on the inner edge ofthe collar E. With this construction it is difficult to maintain-a tight joint between the valve and lthe seat-, and the liquid often leaks through the joint. By providingthe flange of the basket with a rubber packing ringl against which the valve seats itself, the joint between the bottom of the basket andthe valve is made absolutely tight, thereby keeping the space un-f f derneath the basket'perfectly dry. The inwardly projecting portion of the collar above ythe packing ring forms astop which p ositively limits the upward movement'of the sliding vertically on the spindle, and which is v connected with the valve by upright lifting4 rods h,V arranged to slidein vertical openings pass through lugs t, arranged on the sleeve of the valve, and are adj ustably vsecured lthereto by screw nuts il ft2, applied to thelifting rods on the upper and lower sides ofthe lugs i.

fformed in the hub of the spider -C.- The v screw-threaded lower `ends of the lift-ing rods The yupper contracted portion of the lower coupling sleeve is provided with three outwardly projecting equidistant lugs j. K represents an upper vcouplingv sleeve which' couples with the lower coupling sleeve for 60 packingring'and forms a perfectlywaterf holding the valve in its closed position. The upper coupling sleeve is held against vertical movement on the spindle by collars Z l secured to the spindle above and below the upper coupling sleeve, but is permitted to turn on the spindle. This turning movement is limited by a key or stop m, secured to the spindle and engaging in a segmental notch m formed in the bore of the uppercoupling sleeve, as represented in Fig. 8. coupling sleeve is provided in its under side with a cavity which receives the upper portion of the lower coupling sleeve, and the upper sleeve is provided with three inwardly projecting lugs n arranged equidistant and adapted to enter this cavity. Upon raising the valve, the lugs of the lower coupling sleeve pass upwardly between the lugs of the upper coupling sleeve and stand above the lugs of .the latter when thevalye rests against its seat. Upon turning the upper coupling sleeve, ,when .the parts are in Kthis position,

the lngs of the upper sleeve are moved underueath the lugs of the lower coupling.r Sleeve, `whereby the lower sleeve is `coupled to the upper sleeve and the `valve is preyented fron; descending. The `contiguous faces `.of the lugsare preferably inclined in opposite directions, so that, upon turning the upper coupling sleeve, the valve is drawn firmly against its seat, thereby taking up an yvwear on the valve or its seat. When the valve is to be opened, the upper coupling sleeve is turned u util its lugs are moved from underneath the lugs of the lower coupling sleeye. The valve and lower sleeve no w d rop and the dried `salt is discharged through the opening in the bottom of the basket. The upper couplingsleeve is preferably turned by means of a handle o which is inserted in a socketo formed in the l sleeve. The valve is usually raised by ap-` plying a forked lever against the under side of the lower coupling sleeve, but this may be t .tion with the spindle, the basket in oun-,ted

accomplished in any other suitable manner.

I claim as my invention?- 1. In a centrifugal salt drier the combinay tion `with the spindle, and the perforated baskept provided at its lower end with an interl nal annular flange, said Iiange having in its inner face an annular groove and a flexible packing ring arranged in said groove, of a valve adapted to bear with its marginal por- 1 tion against said packing ring and close the bottOllof the basket, su bstantially as set forth.

2. In a centrifugal salt drier the combination .with the spindle, and the perforated basket provided at its lower end with an internal annular flange, said flange having in its inner face an annular groove, a flexible packu ing ring arranged in said groove, and `above the packing ring an annular stop projecting inwardly beyond said packing ring, `ot' a ver- :u

The upper tically movable valve, adapted to seat itself with its marginal portion against said packing ring and limited in its upward movement by said stop, substantially as set forth.

3. I-n a centrifugal salt drier the combination with the spindle, the basket mounted thereon,` 'and the vertically movable valve adapted to close the bottom of the basket, of a lower coupling sleeve connected with the valveand arranged to slide vertically upon the spindle and an upper coupling sleeve held against vertical moveinenton the spindle but adapted to turn on the same and interlock with the lower coupling sleeve for holding the 'valve in its closed position, substantially as set forth.

4- In ,a centrifugal Salt dleffh @Clubwetion with the spindle, the basket @parted thereon, and the `venticluy 4movable yalve adapted .to close 4 the bottom of the basket, of

a lower coupling sleeve `connected .with .the l valve and arranged to slide yertiea-lly on the spindle and proyided `on `its upper `side `with "lues and upper @Gerling ,Sleere held against rei-tical irreverent on the Spindle but l arranged t0 turn en the spindle, amitie el on its under side with lugs adaptedtointer-v k with the lugs` of the lower ceuplirs sleeve.`

substantially as set forth. u l

5. In a centrifugal salt drier the @ambitie tion with the spindle, the basket mwlntafl thereon, and the verticallymovable `valve adapted to close the bottom` of the basket, of

valve, capable ot' .yerttical )moyernent on the Srndleaud provided with lugs, er unpsrrerr- 1 ling sleeve arranged to tu rn on the spindleand l ICO provided with lugs adapted to'interleck with the lugs of the lower coupling sleeye, and collars `secured to the spindle aboye `and below the `upper `coupling sleeve, snbstantiallyas 4set forth. l l a `6. In a centrifugal salt drier the `combina-` lzhereon, and the `vertically movable valve adapted .to close the bottomof the basket, of e lower Coupling Sler onilscredwwith the yalve, capable of vertical vmovement `,on the ITO spindleand providedwtnlugs,an,upperconpf ling sleeve held against vertical movement on th .Spindle and provided with e segmental notch in its bore and with lugs adapted toengage with the lugs of the lQWe/ncoupling sleeye, and a stop arranged on the spindle and engaging in said segmental notch,substantially as set forth.

Vitness my hand this 23d day of .Marcin 1893.

JOSEPH M- DUNCAN- Witn esses M. E. Calmann, M. L. LAMnnnsoN.

t 9S` a lower coupling sleeye connected with the 

